Chapter 7 Appendix; Self-Diagnostic Function; Overview - Hitachi VM-H675LA Service Manual

CHAPTER 7
1.

SELF-DIAGNOSTIC FUNCTION

1.1 Overview

The camera/recorder has the following self-diagnostic
function.
Occasional defect self-diagnostic function (A mode)
Mechanical block self-diagnostic function
(B mode)
CAMERA BLOCK
MIC UNIT
TROUBLE
SENSOR
ESS
SUPPLY
END
SENSOR
RSS
SUPPLY
REEL
SENSOR
SYSTEM CONTROL SERVO
CIRCUIT CIRCUIT
LOD, UNL
LOADING
CYLINDER
MOTOR
END LED
Fig. 1-1 Self-Diagnostic Coverage Range
APPENDIX
Fig. 1-1 shows the self-diagnostic coverage range.
The self-diagnostic functions of the camera/recorder are
engaged by the system control (S) µP (IC0901) which
detects, memorizes and displays data related to defects in
the mechanical block control system.
VIDEO SIGNAL
PROCESS CIRCUIT
AUDIO SIGNAL
PROCESS CIRCUIT
SELF-DIAGNOSIS COVER RENGE
CFG
S30
CAPSTAN
MOTOR
RST EJT, UST, REW,
LST, FWD, HEC
TAKE-UP
REEL
MODE SW
SENSOR
AUDIO VIDEO
SIGNAL SIGNAL
EST
TAKE-UP
END
SENSOR
STG
CASSETTE
HOLDER
SW
TAB, ME, MP
TAPE
DETECT.
SW
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